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Solenoid Valve Circuit NO CODE - Nothing happens when <br /> water flow is activated <br /> • Ensure dip switch on PC board is in the <br /> OFF position. Verify you have at least the minimum <br /> Ensure gas control wire is not loose or flow rate required to fire unit. <br /> damaged. Measure the resistance of the water <br /> Ensure heater circuit is not grounded. flow control sensor.* <br /> tFReplace PC Board. Clean inlet water supply filter. <br /> lame Rod On new installations ensure hot and <br /> Check flame rod and wire for damage. cold water lines are not reversed. <br /> Verif HEX is not leaking. Cascade Diagnostic Display <br /> Maintenance Indicator (Commercial units only) <br /> • Placeholder in Diagnostic code history With cascade connections, display <br /> indicating that a service provider will flash between "SE" and the <br /> performed maintenance or service. selected set temperature when <br /> Enter this code after performing service an error code is displayed on any <br /> by pressing A (Up) , V (Down) and secondary unit. <br /> On/Off simultaneously. <br /> • FF is visible on the monitor. <br /> 'FM o In Use <br /> EI E <br /> ApppK WpIRTNrp, <br /> ao Priariiy <br /> t water tam <br /> On/O <br /> OAIG91-01131Y <br /> (SS) Service Soon (Flush Heat <br /> Exchanger) <br /> • SS is a time-based service indicator set <br /> during installation. See section "3.12 <br /> Parameter Settings"for additional <br /> details on setting and changing the SS <br /> indicator. <br /> SS indicates that it is time for service. <br /> The heat exchanger should be flushed <br /> to prevent damage (refer to section <br /> "6.3 Flushing the Heat Exchanger"for <br /> more information). Hard water must <br /> be treated to prevent scale build-up <br /> or damage to the heat exchanger. <br /> To reset the SS code, push the On/Off <br /> button on the temperature controller 5 <br /> times in 5 seconds. <br /> * See "Electrical Diagnostics" on Technical Data <br /> Sheet located on inside front cover of water heater. <br /> Rinnai Tankless Water Heater Installation and Operation Manual 79 <br />